## When to answer by CONCEPT in GMAT Data Sufficiency questions…

While it might be tempting to plug in numbers for most DS questions, here’s a case where you don’t really need to. In fact, plugging in might be counter-productive!

It’s helpful to think about what a question is really asking and to work from there.

## In a case such as this one, I will separate out the two Statements for you:

- Note that the right side of S1 will always be positive. Work from this standpoint. See? SUFFICIENT.
- You can see that 0 and 1 work, but given what’s here, ALL PERFECT SQUARES actually work. That implies of course that some answers will be less than 3 and some will be greater than 3. INSUFFICIENT.

And… we’re done.

## Notice how quickly a question like this can go as soon as we understand the concept properly. Watch the video for more details!

**GMAT Data Sufficiency** is fun!

Is the integer k greater than 3 ?

(1) The sum of -4 and k equals the square of an integer.

(2) k equals the square of an integer.